Giant ethmoid mucocele presenting as an orbital mass.

Mucocele is a benign and expansile cystic lesion lined with respiratory mucosa of pseudo stratified columnar epithelium. Mucocele most commonly produces bone destruction within the paranasal sinuses. It mostly involves the frontal sinus followed by ethmoid and rarely sphenoid and maxillary sinuses. We report a case of giant ethmoid mucocele who presented with history of progressive unilateral protrusion of eye since 5 years. CT scan revealed a large mucocele of the ethmoid sinus with orbital extension on the same side. He was successfully treated with endoscopic sinus surgery.